In this video we will discuss a SQL interview question asked in American Express Data Analyst Interview.
High Quality Analytics Courses : [ Ссылка ]

script:
CREATE TABLE friends (
user_id INT,
friend_id INT
);

-- Insert data into friends table
INSERT INTO friends VALUES
(1, 2),
(1, 3),
(1, 4),
(2, 1),
(3, 1),
(3, 4),
(4, 1),
(4, 3);

-- Create likes table
CREATE TABLE likes (
user_id INT,
page_id CHAR(1)
);

-- Insert data into likes table
INSERT INTO likes VALUES
(1, 'A'),
(1, 'B'),
(1, 'C'),
(2, 'A'),
(3, 'B'),
(3, 'C'),
(4, 'B');


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#sql #dataengineer

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